Weight duryea



W. DURYBA. Electro-Magnetic Low-Water Indicator.

Patented Aug. 9, 1870.

u M fll-ivl...2112717.21111111.11.17.. 1 1 1 diluted gieten WRIGHT DURYEA, OF GLEN COVILNEW YORK.

Letters .Patent No. 106,141, dated August 9, 1870.

ELECTRO-MAGNETIC LOW-WATER ALARM FOR STEAM-BOILERS.

'The Schedule referred to in these Letters Patent and. making part of the same To all 11u/tom it muy concern Be it known that I, XVRIGIIT DURYEA, of Glen Cove, in the county of' Queens and State of New York, have invented a new and useful Electro-Magnetic Low-fatter Alarm forSteam-Boilers; and I do hereby declare that the followingis a f'ull, clear, and exact description of the same, reference being had tothe accompanying drawing forming part 'lof this specification.

The object, ot' this invention is to provide with greater certainty for the sounding ot' an alarm at any distance from a steam-boiler, whenever the water therein shall fall below a certain level.

It consistsin arranging, within or in suitable connection with the boiler, a port-ion of the conductor of' an electric circuit, in which there is placed, outside of' the boiler, a suitable electro-niagnetic call or alarm, and in providing, within the said circuit, a circuitbreaker, which is so actuated by a float or other device, which depends f'or its position on the height of the water in the boiler, tha-t the opening and closing ot' the circuit shall be produced by the risc and fall of' the water above and below the desired level, and that, when the water ets below that level, the call or alarm shall be sounded.

The invention is capable of lnany modifications, but, to enable others to construct and apply it, I will proceed to describe that form which I consider the simplest, and which is illustrated in the accompanying drawing, in which- Figure 1 is a central vertical section, and

Figure 2 a horizontal section in the line x z of tig. 1.

Similar letters of' refercnce'imlicate corresponding parts in bot-h figures.

A is a. tube, of' glass or other material, which is a non-conductor of electricity, inserted through and tightly clamped in a stufling-box,B, which is screwed into or`0therwise tightly secured in the top ofthe boiler. 'This tube extends downward below the lowest desirable water-level.

a is the packing, of India. rubber or other suitable material, by which the tube is firmly clamped, and by which leakage of steam around the tube is prevented.

Within the tube A two smaller tubes, C C, of similar non-conducting material, are secured andpacked, by suitable cement, such as a mixture of red lead, linseed oil, and iron filings, which is impervious to water and steam. Through these tubes C C' are inserted two wires, b b',

which form portions of' the electric circuit or conductor, and these wires are secured and packed in the said tubes by cement of' similar nature to that employed to secure the tubes C C in the larger tube A.

rIhe wires, which are insulated from each other by small glass tubes, and insulated from the boiler by the larger tube, have their lower ends extended through the bottoms ot' all the tubes, and have elastic terminations, which are turned up,l as shown at c c, in fig. 1, to enable the circuit to be closed between them by the circuit-breaker, as will be presently described.

Ihe upper portions of" the wires, which extend through the upper ends of' the tubes, are intended to be connected with a galyanic battery', and with an electro-magnetic call, such as is used in telegraph ollices, or with au electro-magnetic alarm, such as is used in burglar-alarms, or with any electro-magnetic apparatus capable of' producing sounds by striking a bell, or'acting on any other sounding device. This call, alarm, or sounding apparatus may be in the engine-renin, or in anyplace more or less distant from the boiler, where it may be desirable to have known the deficiency of water therein.

l) is a circuit-breaker, consisting of a hollow-metal float, of annular form, fitted to slide very freely upon the exterior of the tube A, and floating on the water in the boiler, so that it will move up and down the tube as the level of' the water varies.

This circuit-breaker or float is so applied, a-nd the Aelastic terminations of' thc wires c care so arranged that, while the water is above the lowest level to which it is desired that it shall fall, the circuit-breaker or lloat shall be out of' contact with the wires, and t-he circuit shall remain open, but whenever the water falls to that level, it, the circuit-ln'eaker or float, shall come in contact, as shown in dotted -outline in tig. 1, with both of' thc terminations c c of the wires, and so close the circuit and set the call or alarm in operation.

That I claim as my invention, and desire to secure by Letters Pat-ent, is*

rlhe combination of' the oating circuit-breaker D, the insulating-tube A, and the insulated circuit-wires b b', t-o operate substantially as herein described, for the purpose set forth.

WRIGHT DURYEA.

Witnesses:

FRED. HAYNES, FERDINAND TUSCH. 

